romney is reacting to that. he's said clearly i'm not going to increase the tax burden of the middle class. i think the problem is that he hasn't given any details that allow us to see a plan that does add up. as he said yesterday, he's not promising a tax cut, he's promising tax reform. the question that people have, the reason reasonable question, let's see details. >> what does mitt romney, what does the republican party define as middle class? if you look at martin feldstein's analysis, a romney guy you have to raise taxes on people making between $100,000 and $200,000 a year which is in certain cities decidedly middle class the definition of middle class is bipartisan issue. president obama defines it anyone making up to $200,000. if you're making 100,000, 150,000, 200,000 you're in the top few percentage points of this country. even in expensive places people making $150,000 have a pretty tenuous claim on being middle class when you look at the numbers. >> thank you to david leonhardt of "the new york time